Urea and nitrogen stabilizer compositions and methods and systems of making and using thereof

Abstract

This invention relates to an improved urea-nitrogen stabilizer composition and methods, systems and apparatti for making thereof. The nitrogen stabilizer composition is incorporated into molten urea to result in a composition that contains less biuret, NMP, nitrogen stabilizer and/or impurities and provides an effective solid fertilizer. These compositions are useful in odor control.

What is claimed is: 
     
       1. A method of producing a solid urea-nitrogen stabilizer composition comprising:
 a) forming molten urea; 
 b) adding a nitrogen stabilizer composition to said molten urea, wherein said nitrogen stabilizer composition comprises NBPT at a purity of at least 95% by weight; and 
 c) cooling the molten urea-nitrogen stabilizer composition to form the solid urea-nitrogen stabilizer composition. 
 
     
     
       2. The method of  claim 1 , wherein said solid urea-nitrogen stabilizer composition has at least 90% of said NBPT remaining after storing the stabilizer composition at 22° C. for 32 days in a glass, well-sealed container. 
     
     
       3. The method of  claim 1 , further comprising adding a nitrification inhibitor prior to said cooling. 
     
     
       4. The method of  claim 3 , wherein the nitrification inhibitor is dicyandiamide (DCD). 
     
     
       5. The method of  claim 3 , wherein the nitrification inhibitor is selected from the group consisting of thiourea, 1-mercapto-1,2,4-triazole, 2-amino-4-chloro-6-methyl-pyramidine, 2,4-diamino-6-trichloro-methyltriazine, 2-chloro-6-(trichloromethyl-pyridine), 3,4-dimethylpyrazole phosphate (DMPP), 1H-1,2,4-triazole, 3-methylpyrazole, azadirachta indica Juss (Neem) and nitrapyrin. 
     
     
       6. The method of  claim 3 , wherein said adding a nitrification inhibitor occurs prior to said adding a nitrogen stabilizer composition. 
     
     
       7. The method of  claim 3 , wherein said nitrification inhibitor and said nitrogen stabilizer composition are added simultaneously prior to said cooling. 
     
     
       8. The method of  claim 1 , wherein the solid form of the urea-nitrogen stabilizer composition is a granule, a prill, a pellet, a pastille, or a compounded form. 
     
     
       9. The method of  claim 1 , further comprising adding a dye prior to said cooling.